The application of long pulse lasers or wideband light sources with tens or hundreds of milliseconds pulse width is inefficient and can cause uncontrolled overheating and coagulation of surrounding tissues.
To destroy tattoo dye, Q-switched lasers with units or tens of nanoseconds pulse width are traditionally used. At achieving a certain power density of nanosecond pulse, the dye absorption coefficient increases drastically, and high-powered acoustic waves, destroying intermolecular bonds of dye particles, are created.
During the pulse, dye particles have no time to pass the energy in the form of heat to the surrounding tissues. Thus, a minimal thermal influence on biological tissues is exerted.
A disadvantage of the traditional method is the necessity to perform a great number of procedures because the emission of high-powered single pulses is completely absorbed in the upper layer of dye and does not penetrate deeper. The attempts to increase the pulse power or to repeat the treatment of the area within one session lead to mechanical damage of the skin and do not have effect.
The new method of tattoo photodestruction (DeepAcousticWave Technology™) allows the process of tattoo removal to be accelerated to several times the traditional rate. The method is capable of destroying the dye along all its depth with minimal damage to surrounding undyed tissues and without influence on the natural pigmentation of the skin.
In contrast to classical Q-switched methods, influencing with single laser pulses, the method used in our device, allows the destruction of the dye of both professional and amateur tattoos. This is due to the fact that each pulse of the pack causes a fragmentation of one layer of dye, making way for next pulse. In this way, a layer-by-layer fragmentation of all dye particles of the tattoo is performed.
The new method has another considerable advantage – selectivity. The laser emission aims only at the tattoo dye, and not the skin structure.
The whole dye volume is destroyed by being exposed not to one high-powered wave, but rather to a sequence of small-powered waves that makes the method by far less traumatizing.
One more advantage of the MULTILINE™ apparatus is the possibility to select an optimal wavelength for every dye colour: 540 nm, 694 nm, 755 nm, 1079 nm.

Fig. 1. Occurrence of the tattoo dye in the skin.

Fig. 2. Layer-by-layer destruction of the tattoo dye at all its depth.

Application: professional and amateur tattoos of different colours.
Complete treatment: 1-5 procedures.
Laser type: Nd:YAP/Q-Switched, Nd:YAP/KTP/Q-Switched, RUBY/Q-switched, Alex/Q-Switched.

The method is patented and can be applied only by LINLINE GmbH.